![]() There are different methods for modelling the same real world features in Openstreetmap. highway= pedestrian + area= yes to define a pedestrian square or plaza.Īreas can also be described using one or more ways which are associated with a multipolygon relation.ĭifferences between linear and area representation of features.amenity= school to define the outline of a schoolįor tags which can be used to define closed polylines it is necessary to also add an area= yes if an area is desired.leisure= park to define the perimeter of a park.Examples of areas defined as closed ways include: Most closed ways are considered to be areas even without an area= yes tag (see above for some exceptions). Overpass QL parameter/operator is_closed Overpass_QL#Geometry_Related_Operators & example overpass-turbo query: Overpass_API/Overpass_API_by_Example#Limit_results_to_areas_only Area Main article: AreaĪn area (also polygon) is an enclosed filled area of territory defined as a closed way. barrier=* Closed ways are used to define barriers, such as hedges and walls, that go completely round a property.Ī closed way that has the tag area= yes should always be interpreted as an area (but the tag is not required most of the time: see 'area', below). ![]() highway=* Closed ways are used to define roundabouts and circular walks.The following closed ways would be interpreted as closed polylines: A closed way may be interpreted either as a closed polyline (a linear representation of a feature), or as an area representation of a feature, or both, depending on its tags and the tags on its relations. In a closed way the last node of the way is identical with the first node. See here for how to identify the direction of a 'way'. This is true even if the ground feature it represents is 'two-way' (e.g., most roads, where traffic passes in both directions) or has no direction (e.g., a wall). In the database, a way always has a direction. Common examples of linear representation with open ways include most roads, streams and railway lines, because these start in one place and finish in another. In an open way (a linear representation of a feature) the first and last node are not identical. 1.4 Differences between linear and area representation of features.
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